21033202212 has 144 divisors (see below), whose sum is σ = 59529637440. Its totient is φ = 6206284800.

The previous prime is 21033202207. The next prime is 21033202261. The reversal of 21033202212 is 21220233012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11997528 + ... + 11999280.

It is an arithmetic number, because the mean of its divisors is an integer number (413400260).

Almost surely, 2^21033202212 is an apocalyptic number.

21033202212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21033202212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29764818720).

21033202212 is an abundant number, since it is smaller than the sum of its proper divisors (38496435228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21033202212 is a wasteful number, since it uses less digits than its factorization.

21033202212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554 (or 2549 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21033202212 its reverse (21220233012), we get a palindrome (42253435224).

The spelling of 21033202212 in words is "twenty-one billion, thirty-three million, two hundred two thousand, two hundred twelve".